With Assura 1-piece drainable, the adhesive barrier is permanently attached to the pouch. To change the pouch, the whole appliance is removed and replaced at once. Assura 1-piece drainable appliances are available with flat, convex light, or convex adhesive barriers. The full line includes transparent and opaque pouches with barriers that are pre-cut (already cut to size) or "cut-to-fit" (meaning they can be cut to achieve a custom fit).